The invention discloses a depth image obtaining method for an integrated imaging system. Firstly, multiple views of different viewpoints are generated by utilizing a computer reconstruction method; N views with continues horizontal parallaxes are selected from the views, the left-most or the right-most view is used as a reference image, stereo matching is carried out on the reference image and other views respectively, and (N-1) parallax images are obtained; proportional function fitting is carried out on (N-1) parallax values of each pixel on the basis of the (N-1) parallax images of the reference image, a fitting coefficient is the parallax value between the corresponding pixel and the nearest view, and a depth image of the reference image is obtained through calculation according to the relational expression between the parallax and depth. According to the depth image obtaining method for the integrated imaging system, the process of depth measurement is simplified, the stereo matching process is easy to achieve, mismatching among the views in image edge areas and depth discontinuous areas is lowered, mismatching generated due to noise recording and other factors is eliminated, and the accuracy of the depth image is improved.